How JavaScript simplifies branch conditional statements

This article mainly introduces how JavaScript simplifies branch conditional statements, which has certain reference value. Interested friends can refer to it. I hope you will gain a lot after reading this article. Let Xiaobian take you to understand it together.

simplified branch conditional statement

You again, if... else if... else! Similar to switch, it can also be simplified with key-value form:

// Longhand if (type === 'test1') { test1(); } else if (type === 'test2') { test2(); } else if (type === 'test3') { test3(); } else if (type === 'test4') { test4(); } else { throw new Error('Invalid value ' + type); } // Shorthand var types = { test1: test1, test2: test2, test3: test3, test4: test4 }; var func = types[type]; (! func) && throw new Error ('Invalid value ' + type); func(); What JavaScript does 1. Embed dynamic text in HTML pages. Responding to browser events. Read and write HTML elements. Verify data before it is submitted to the server. 5. Detect the browser information of visitors. Control cookies, including creation and modification. 7. Server-side programming based on Node.js technology.

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